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🔬 Biology  ·  Plant Kingdom  ·  NEET

A haplontic life cycle, where the main plant is haploid and only the zygote is diploid, is typical of:

Answer: Green algae like Spirogyra.

  • A Flowering angiosperms
  • B Seed-bearing gymnosperms
  • C Green algae like Spirogyra
  • D Mosses and liverworts

Correct answer: C. Green algae like Spirogyra

Explanation: Many green algae (e.g. Spirogyra) are haplontic - the dominant phase is haploid and the diploid zygote immediately undergoes meiosis.

Plant Kingdom: Increasing ComplexityAlgaeno roots/leavesBryophyta"amphibians"no vascular tissuePteridophytafirst vascularno seedsGymno-spermsnaked seedsAngio-spermsseeds in fruitNeed for external water decreases left→right; seed enclosure only appears in angiosperms

Plants evolved from water-dependent algae through increasingly land-adapted groups, gaining vascular tissue (Pteridophyta), then seeds (Gymnosperms), and finally fruit-enclosed seeds (Angiosperms) - each step reducing dependence on water for reproduction.

Concept context

Classification of plants from algae to angiosperms. Understanding plant diversity is essential for NEET.

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